Yamaha RD125 (1979-80)

The Yamaha RD125 motorcycle was manufactured in 1979 and 1980. The bike is powered by a two-stroke, parallel twin engine, with a capacity of 124cc. The air-cooled engine has a bore x stroke of 43×43 mm and a compression ratio of 6.8:1. The induction system includes two 18mm Teikei carburetors and uses battery coil ignition. The bike is started with a kick. The maximum power output produced is 17 hp / 12.4 kW at 8500 rpm, and the maximum torque is 1.3 kgf-m at 8000 rpm. The five-speed transmission drives the bike using a chain final drive with a gear ratio of (1) 34.52 (2) 19.67 (3) 14.11 (4) 11.34 (5) 9.11. The steel tube frame has an engine used as a stressed member, while a 28 mm telescopic fork and dual rear shocks adjustable for preload provide suspension. The bike has a single 240mm disc brake on the front and a 130mm drum brake on the rear. The front and rear tires are 2.75-18 and 3.00-18, respectively. The wheelbase is 1245 mm / 49.0 in, with a seat height of 749 mm / 29.5 in. The bike weighs 115 kg / 255 lbs, and its fuel capacity is 11.5 Litres / 3.04 US gal.

Technical specifications:

Make Model: Yamaha RD 125

Year: 1979 – 80
Engine: Two stroke, parallel twin
Capacity: 124 cc / 7.6 cu-in
Bore x Stroke: 43 43 mm
Cooling System: Air cooled
Compression Ratio: 6.8:1
Induction: 2x 18mm Teikei carburetors
Ignition: Battery coil
Starting: Kick
Max Power: 17 hp / 12.4 kW @ 8500 rpm
Max Torque: 1.3 kgf-m @ 8000 rpm
Transmission: 5 Speed
Final Drive: Chain
Gear Ratio: (1) 34.52 (2) 19.67 (3) 14.11 (4) 11.34 (5) 9.11
Frame: steel tube engine used as a stressed member
Front Suspension: 28 mm telescopic forks
Rear Suspension: Dual rear shock pre-load adjustable
Front Brakes: Single240mm disc
Rear Brakes: 130 mm Drum
Front Tyre: 2.75-18
Rear Tyre: 3.00-18
Wheelbase: 1245 mm / 49.0 in
Seat Height: 749 mm / 29.5 in
Wet Weight: 115 kg / 255 lbs
Fuel Capacity: 11.5 Litres / 3.04 US gal